Improved paper-pulp engine



"F.EosE. PAEEE PULP ENGINE.

Patented Sept. 14, 1867.

@gunman mmmwfa ,u To'all whom it may concern:

lnitrd giant *I anni (tibios.

Let-ters Patent No. 94,843,11ated Septmnber. 14, 18769.

IMPRovnD :Apen-PULP ENGINE..

The Schedule referred tain these Letters Patent and making part of the same Be it known that I, PELE'G ROSE, of Norwich, in the county of New London, and State of Connecticut, have invented a new and useful Improvement in Paper- Pulp Engine; andfI do hereby declare. that the follow' Alowing is a i'ull, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this speciiication.

This invent-ion relates to a machine called a paperpulp engine,"7 for reducing rags and other paper-stock to a' pulp in the manufacture of paper; and

The iuvention consists in so constructing the t'ub, iu

. which the cylinder revolves, nd the back-fall of the cy1imler,tbat the current. produced by the revolution of the cylinder around what is called the mid-fellow shall not be obstructed by the fibres catching in sharp angles, and so that a more even 0r uniform pulp will be produced, as will be hereinafter more fullydescribed. 11i the accompanying drawings- Figure 1 represents a top or plan view of the engine.

Figure 2 is a vertical cross-section of iig. 1, through the line xp. y Figure 3 is aven-tical longitudinal section of fig. 1, through the line y y.

Similar letters of reference indicate corresponding parts.

A represents the tub;

B is the oylinder;

C, the back-fair; and

I), the mid-fellow.

As these enginesbave heretofore been made, the back-fall C has been carried up to an angle at its top by continuing the curve e, and then dropping bac-k directly, as at f. From the point f the back-fall sloped down to..:the bottom of thetpb, leaving sharp angles 'on each side. These sharp or right vangles were continued around the mid-fellow and around the tub, al lowing the fibre of the `half ground pulpto catch and hangin the angles or corners, thereby obstructing the current. while the libre which thus caught 'in the corners would not receive its proper share of grinding,

lbut being mixed with the rest of the pulp, the result was pulp of uneven ineuess, very detrimental to good paper. g Y

To remedy these evils, I curve or round 01T the top of the back-fall, as seen at g, and curve the'baok slope transversely, as seen at h, and I round the corner or angle of the tub and that of the mid-fellow, as seen at i i.

I do not claim the genera-l arrangement of the engine, nor anything relating to the construct-ion oi' the cylinder or the method of supporting or driving tbe saine; nor to the bed or concave J.

My objeccis, by @instructing the back-t, as shown,

- and filling the angles to prevent the lodging of the tibi-e,

and thereby allow of amore rapid and unobstructed current laround the mid-fellow, while preventing the formation of pulp of uneven iineness, thus greatly improving the operation of the paper-engine.

I propose, also, to curve one side ot' the mid-fellow,

Vand also the corresponding side of the tub, as indicated by dotted lilies in the drawing, should I deem it im portant to do so.

vThe direction :of the revolving cylinder and of the current pulp is indicated by arrows.

Having thus described my invention,

I claim as new, and desire to secure by Letters Patent 1. Constructing the back-fall of a paper-engine, with a tcp curving backfrom the cylinder, as seen at g, and wit-l1 a curved back slope, as seen at li. substantially as described.

2. Constructing the corners of the tub and mid-fellow of a paper-engine, curved in stcad of angular, substantially as and for the purposes-described.

The above specilication of my invention signed by me, -t-his 24th day of July, 1869.

PELEG ROSE.

Witnesses GEO. W. MABEE, EDWARD MARTIN. 

